FLUORINE K-ALPHA X-RAY-EMISSION SPECTRA FROM SELECTED METAL FLUORIDES

With a high-resolution two-crystal vacuum spectrometer, the fluorine K-alpha emission spectra in fluorescence are measured for AlF3, CrF3.xH2O, FeF3.xH2O, NiF2.4H2O, ZrF4, NH4NbF6 and a series of rare-earth trifluorides RF3 (R = La, Ce, Pr, Nd, Sm, Eu and Gd). The measured emission spectra consist of a prominent peak and its high-energy satellites. It is shown that the presence of the K1L1 satellite peak arising from the 1s-1 2p-1 initial state is unclear in LaF3, CeF3, PrF3 and NdF3, in contrast to that of other metal fluorides. This unclear presence is attributed to the F 2p shell vacancy rearrangement through interatomic electronic transitions before 1s hole filling for fluorine K-alpha emission. The emission spectra of LaF3 and CeF3 are compared with the XPS spectra of the F- 2p valence bands obtained by Sato. There is a good agreement between them.